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Add option to ignore Probe Request frames on 2.4 GHz from dualband STA

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The new no_probe_resp_if_seen_on=<ifname> parameter can now be used to
configure hostapd to not reply to group-addressed Probe Request from a
station that was seen on another radio.

This can be used with enabled track_sta_max_num configuration on another
interface controlled by the same hostapd process to restrict Probe
Request frame handling from replying to group-addressed Probe Request
frames from a station that has been detected to be capable of operating
on another band, e.g., to try to reduce likelihood of the station
selecting a 2.4 GHz BSS when the AP operates both a 2.4 GHz and 5 GHz
BSS concurrently.

Note: Enabling this can cause connectivity issues and increase latency
for discovering the AP.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-09-05 17:53:15 +03:00
parent c58b5f65b1
commit 964f64e2ee
5 changed files with 57 additions and 0 deletions
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3
hostapd/config_file.c
View file

@ -3403,6 +3403,9 @@ static int hostapd_config_fill(struct hostapd_config *conf,
conf->track_sta_max_num = atoi(pos);
} else if (os_strcmp(buf, "track_sta_max_age") == 0) {
conf->track_sta_max_age = atoi(pos);
} else if (os_strcmp(buf, "no_probe_resp_if_seen_on") == 0) {
os_free(bss->no_probe_resp_if_seen_on);
bss->no_probe_resp_if_seen_on = os_strdup(pos);
} else {
wpa_printf(MSG_ERROR,
"Line %d: unknown configuration item '%s'",

15
hostapd/hostapd.conf
View file

@ -1289,6 +1289,21 @@ own_ip_addr=127.0.0.1
# Default: 180
#track_sta_max_age=180
# Do not reply to group-addressed Probe Request from a station that was seen on
# another radio.
# Default: Disabled
#
# This can be used with enabled track_sta_max_num configuration on another
# interface controlled by the same hostapd process to restrict Probe Request
# frame handling from replying to group-addressed Probe Request frames from a
# station that has been detected to be capable of operating on another band,
# e.g., to try to reduce likelihood of the station selecting a 2.4 GHz BSS when
# the AP operates both a 2.4 GHz and 5 GHz BSS concurrently.
#
# Note: Enabling this can cause connectivity issues and increase latency for
# discovering the AP.
#no_probe_resp_if_seen_on=wlan1
##### Wi-Fi Protected Setup (WPS) #############################################
# WPS state

2
src/ap/ap_config.c
View file

@ -566,6 +566,8 @@ void hostapd_config_free_bss(struct hostapd_bss_config *conf)
wpabuf_free(conf->own_ie_override);
#endif /* CONFIG_TESTING_OPTIONS */
os_free(conf->no_probe_resp_if_seen_on);
os_free(conf);
}

2
src/ap/ap_config.h
View file

@ -554,6 +554,8 @@ struct hostapd_bss_config {
int radio_measurements;
int vendor_vht;
char *no_probe_resp_if_seen_on;
};

35
src/ap/beacon.c
View file

@ -622,6 +622,29 @@ static void sta_track_add(struct hostapd_iface *iface, const u8 *addr)
}
static int sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr,
const char *ifname)
{
struct hapd_interfaces *interfaces = iface->interfaces;
size_t i, j;
for (i = 0; i < interfaces->count; i++) {
iface = interfaces->iface[i];
for (j = 0; j < iface->num_bss; j++) {
struct hostapd_data *hapd = iface->bss[j];
if (os_strcmp(ifname, hapd->conf->iface) == 0)
break;
}
if (j < iface->num_bss && sta_track_get(iface, addr))
return 1;
}
return 0;
}
void handle_probe_req(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
int ssi_signal)
@ -787,6 +810,18 @@ void handle_probe_req(struct hostapd_data *hapd,
/* TODO: verify that supp_rates contains at least one matching rate
* with AP configuration */
if (hapd->conf->no_probe_resp_if_seen_on &&
is_multicast_ether_addr(mgmt->da) &&
is_multicast_ether_addr(mgmt->bssid) &&
sta_track_seen_on(hapd->iface, mgmt->sa,
hapd->conf->no_probe_resp_if_seen_on)) {
wpa_printf(MSG_MSGDUMP, "%s: Ignore Probe Request from " MACSTR
" since STA has been seen on %s",
hapd->conf->iface, MAC2STR(mgmt->sa),
hapd->conf->no_probe_resp_if_seen_on);
return;
}
#ifdef CONFIG_TESTING_OPTIONS
if (hapd->iconf->ignore_probe_probability > 0.0 &&
drand48() < hapd->iconf->ignore_probe_probability) {